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I'm curious about putting the later 6 in an AD, since it will take the higher revs accompanying the stock rears better than the older engine

yet another good point. Thanks Frank. Didn't think about that one. grin

I've driven my '66 w/230 on the interstate for over 100 miles, taching at LEAST 3k the entire trip. And I've done several 50-70 mile stretches taching 3500 rpms. Totally stock! No problems whatsoever. :p

-ftyler